Closure for storage-battery cells



Feb., 5 19242 394.52953@ J. L. WQODBRmGE CLOSURE FOR STORAGE BATTERY CELLS Filed Feb. 24 1922 Patented Feb. 5, 1924.

A maar rare.

CLOSURE FOR STORAGE-BATTERY CELLS.

Application led Februaryafl, 1922. .Serial No. 538,957.

v To all whom t may concern.'

Be it known that I, JOSEPH L. WOODBRIDGE, a citizen of the United States residing at Philadelphia, in the county of lPhiladelphia and State of Pennsylvania, have invented a new and useful lmprovement in Closures for Storage-Battery Cells, of which the following is a specification.

The principal objects of the present invention are to provide a filling opening and vent closure for the cover of a storage battery cell which shall be of simple and convenient construction, and which shall exclude dirt and dust, oppose the escape of spray and drain it back into the cell and provide proper ventilation.

Other objects of the invention will appear from the following description at the end of which the invention will be claimed and which will be made in connection with the accompanying drawings forming part hereof and in whlch- Figure 1 isa side view of the cap.

Fig. 2 is a sectional view showing a closure embodying orie form of the invention,.

Fig. 3 is a plan view of the under side of the cap.

Referring to the drawings, the vent opening in the cover a, ofthev cell consists of `an outwardly Haring seat element or conically shaped barrel l, extending above the upper surface of the cover in the form of a circular boss or rim 2, and having an internally projecting circular ledge 3 at the bottom. The vent cap 4 yis provided with a cylindrical projection 5 which when the cap is in place extends into the vent opening and rests on the ledge 3. The cap 4 extends over the boss 2 and is provided wlth a downwardly projecting skirt or rim 6 which serves to prevent dirt from getting into the cell. The rim 6 of the vent cap is prevented from coming into contact with the boss 2 of the covfer by reason of the ledge 3 at the bottom of the vent opening, which supports the vent cap 4in a position to provide clearance between Gand 2. Furthermore the vent cap 4 is centered in the'vent opening by the taperin ribs A7 located at intervals around the periphery 'of the cylinder 5 and whose outer edges t closely against the inner surface of the barrel 1. The spaces between the cylinder 5 and the barrel 1 serve as condensing chambers or spray traps, to prevent the escape of spray from the electrolyte inl the cell, which may be thrown up by the gassing during charge or by any violent rne chanical motion of the cell. Any drops of electrolyte which may collect in this space will fall to thebottom and will be dralned back into the cell through the openings 8 which consist of small grooves in the lower surface of the cylinder 5. If, however, the lower surface of the cylinder 5 is somewhat irregular, this drainage may be provided Without constructing these special grooves 8. -Vent o enings 9 are shown in the barrel' l to permit the escape of gas from the cell. This gas passing through these small openings at a comparatively high velocity may carry some entrained moisture which, however, will be deposited on the opposite surface of the cylinder 5 and drained back into the cell. y

4It is important that there should be some clearance between the overhanging lip 6 of the `vent cap and the boss 2 of the cover, since if, these two come in contact, the e'ect of capillary action is to collect moisture between them which runs down `on the upper surface of the cell when the vent cap is removed. The construction shown prevents this action.

from the spirit of the invention which isnot limited to such matters or otherwise than as the prior art and the appended claims may requ1re. I claim:

1. A vent closure for storage battery cells comprisingin combination a cell cover having a flaring wall providing a illing opening and terminating in an inturned ledge, an externally cylindrical cap overhanging one end of said wall and spaced from the cover and seated on the ledge to provide for ventilation at all times, and spacing ribs between the cylindrical portion of the lcap and the face of the fla-ring wall.

2. A vent closure for storage battery cells comprising in combination a cover, an outwardly flaring seat or barrel element extending throu h and above and below the cover and provlded below the cover with an in? turned ledge, and e cylindrical cep'element restin on the ledge and provided with specing r1 s for co-opereton with the. Haring wall of the seat element and Witlra projecting downwardly aroundv the upper end of the seat elemenfrI end spaced from the latter and. from the cover to provide ventile- W tion at all times. l

3 A vent closure for storage battery cells comprising' detachably nested seat and cap elements having Haring and cylindrical confronting walls of Whlch walls one is provided with specn ribsand of which elements one is provi ed with an inturned ledge for supporting the other element in spaced relation to provide between the Walls and ribs chambers havin open tortuous inlets and outlets, substenmelly es described.,

,JOSEPH n WOODBRIDGE. 

